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Finding the Fourth Proportional to 6,387.80, 9,581.70 and 4,659.80

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Solution

The fourth proportional to 6,387.80, 9,581.70 and 4,659.80 is: 6,989.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,387.80 : 9,581.70 = 4,659.80 : x
  2. Step 2: Convert to fraction form
    6,387.80/9,581.70 = 4,659.80/x
  3. Step 3: Cross multiply
    6,387.80x = 9,581.70 × 4,659.80
  4. Step 4: Simplify right side
    6,387.80x = 44,648,805.66
  5. Step 5: Solve for x
    x = 44,648,805.66/6,387.80
  6. Step 6: Final answer
    x = 6,989.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.